Robert Downey, JR. struggled to accept an extra special birthday gift from Jamie Foxx - because the horses the RAY star bought for his pal "terrified" the IRON MAN.Downey, Jr. celebrated turning 45 last month (04Apr10) with a big bash emceed by Foxx, his co-star in The Soloist. But he was left stunned when Foxx gifted him with horses for his new Malibu, California ranch - because the present was so over-the-top. Downey Jr. says, "We had this blowout birthday party... (Foxx) basically emceed my whole party. "We have this little farm, like horse ranch type thing now and he said, 'I don't know why you don't have any horses - oh crap - now you do!' And he got me horses. I'm terrified of horses. It's ridiculous..." And now Downey, Jr. fears he's going to have to come up with a bigger and more elaborate present for Foxx when he turns 43 in December (10): "How do I top that? What do I get for him? What am I supposed to do?"